Hoya 46mm (Moose) Warm Circular Polarizer Glass Filter

Yes it does rotate to adjust the polarizing effect.

Unfortunately, the Hoya (Moose) Warm Circular Polarizer Glass Filter is not available in 86mm or 95mm sizes.

The Moose Warm Circular Polarizer is not coated.

Yes, the Hoya 82mm Moose Peterson warm circular polarizer has front filter threads for stacking additional filters. Please be aware that due to the thickness of this filter, stacking more filters could potentially lead to vignetting issues with certain lenses (usually wider-angle lenses).

No not really, you can achieve similar results in post, but it is almost always better to expose the image as intended in the camera compared to in post. It gives a more authentic/natural and cleaner look.

It sounds like you may have screwed it in too tightly and the outer ring is probably spinning when you try to unscrew it. Please remember that it will be righty tighty lefty loosey. Try using something like a rubber band to grip the inner ring on the lens side and gently but firmly twist it in a counter clockwise direction as you are facing the filter on the lens.

Yes it will. I use it on my canon 58mm Ef s lenses.

Yes there are threads on the front. I use this filter on my native Sony E-mount lenses and the original Sony cap fits fine.